Compare / head-to-head
Gemini 2.5 ProvsGemini 3.1 Flash-Lite
Gemini 2.5 Pro leads 3 of 5 shared benchmarks. Gemini 3.1 Flash-Lite is 6.4x cheaper per token. Both offer a 1.0M-token context window.
Benchmarks from cited public sources; pricing from official pages; status from official provider feeds.
Shared benchmarks
3 – 2
Gemini 2.5 Pro leads
Cheaper per token
Gemini 3.1 Flash-Lite
6.4x cheaper, input + output
Larger context
Tie
both 1.0M tokens
Provider uptime (30d)
100%
Google
Gemini 2.5 Pro
Google · released 2025-06-17
textvisionaudio
Gemini 3.1 Flash-Lite
Google · released 2026-03-03
textvisionaudio
Quality
Benchmark matrix
5 shared · 7 only Gemini 2.5 Pro · 4 only Gemini 3.1 Flash-Lite| Benchmark | Gemini 2.5 Pro | Gemini 3.1 Flash-Lite | Δ | Edge |
|---|---|---|---|---|
| Reported by both · 5 | ||||
| GPQA Diamond | 86.4% ↗ | 86.9% ↗ | -0.5 pt | Gemini 3.1 Flash-Lite |
| Humanity's Last Exam (no tools) | 21.6% ↗ | 16% ↗ | +5.6 pt | Gemini 2.5 Pro |
| FrontierMath Tiers 1-3 v2 (Epoch AI run) | 24.6% ↗epoch | 27.7% ↗epoch | -3.1 pt | Gemini 3.1 Flash-Lite |
| LiveCodeBench | 74.2% ↗ | 72% ↗ | +2.2 pt | Gemini 2.5 Pro |
| OTIS Mock AIME 2024-2025 (Epoch AI run) | 84.7% ↗epoch | 80% ↗epoch | +4.7 pt | Gemini 2.5 Pro |
| Only Gemini 2.5 Pro reports · 7 | ||||
| SWE-bench Verified | 59.6% ↗ | not reported | — | — |
| AIME 2025 | 88% ↗ | not reported | — | — |
| LMArena Elo | 1457.8 ↗ | not reported | — | — |
| Aider Polyglot | 82.2% ↗ | not reported | — | — |
| FrontierMath Tier 4 v2 (Epoch AI run) | 0% ↗epoch | not reported | — | — |
| MMMU | 82% ↗ | not reported | — | — |
| SWE-bench Verified (Epoch AI run) | 57.6% ↗epoch | not reported | — | — |
| Only Gemini 3.1 Flash-Lite reports · 4 | ||||
| MMMLU | not reported | 88.9% ↗ | — | — |
| MMMU-Pro | not reported | 76.8% ↗ | — | — |
| MRCR v2 (128k average) | not reported | 60.1% ↗ | — | — |
| SimpleQA Verified | not reported | 43.3% ↗ | — | — |
Scores tagged "epoch" or "matharena" are independent runs, used only where the lab has not published its own; ⚠ marks rows MathArena flags as released after the competition. Higher is better on every row. Δ is Gemini 2.5 Pro minus Gemini 3.1 Flash-Lite in the benchmark's own unit. "Not reported" means the lab has not published that figure; it is not a zero. ↗ opens the source.
Specs & pricing
Side by side
Official pricing pages and model cards| Spec | Gemini 2.5 Pro | Gemini 3.1 Flash-Lite | Edge |
|---|---|---|---|
| Context window | 1.0M tokens | 1.0M tokens | Tie |
| Max output | 66K tokens | 66K tokens | Tie |
| Input price / 1M | $1.25 ↗ | $0.25 ↗ | Gemini 3.1 Flash-Lite |
| Output price / 1M | $10 ↗ | $1.5 ↗ | Gemini 3.1 Flash-Lite |
| Cached input / 1M | $0.125 ↗ | $0.025 ↗ | Gemini 3.1 Flash-Lite |
| Input + output / 1M Lower is cheaper. List prices; batch, tool and regional fees excluded. | $11.25 | $1.75 | Gemini 3.1 Flash-Lite |
| Modalities | text · vision · audio | text · vision · audio | Tie |
| Released | 2025-06-17 | 2026-03-03 | — |
| Cited benchmark scores | 14 | 10 | — |
Reliability
Google status
Last 60 days · refreshed daily on this page · live on /statusMore matchups
Gemini 2.5 Pro vs …
Models sharing the most benchmarksMore matchups
Gemini 3.1 Flash-Lite vs …
Models sharing the most benchmarksBuilt by Respan
Which one wins on your data?
Public benchmarks are a starting point. Run Gemini 2.5 Pro and Gemini 3.1 Flash-Lite on your own prompts with Respan evals, or route to either through one gateway key with automatic failover.